Defecation is a natural and essential function of the human body. However, the word "defecates" may not be the most appropriate word to use in all contexts. If you are looking for synonyms for the word "defecates", words like "eliminates" or "evacuates" may be more fitting in formal settings. In more casual settings, words like "poops" or "takes a dump" can be used. Ultimately, the choice of words to describe defecation should be determined by the context and level of formality of the situation. Whatever word is used, it's important to remember that defecation is a normal and necessary bodily function.